Multi-hop wireless networks are usually defined as a collection of nodes equipped with radio transmitters, which not only have the capability to communicate each other in a multi-hop fashion, but also to route each others' data packets. The distributed nature of such networks makes them suitable for a variety of applications where there are no assumed reliable central entities, or controllers, and may significantly improve the scalability issues of conventional single-hop wireless networks. This book mainly investigates two aspects of the research issues related to the efficient multi-hop wireless networks designs, namely: network protocols and network management, both in cross-layer design paradigms to ensure the notion of service quality, i.e., quality-of-service (QoS) in wireless mesh networks (WMNs) for backhaul applications and quality-of-information (QoI) in wireless sensor networks (WSNs) for sensing tasks. This book uses different network settings as illustrative examples to demonstrate the efficiency and correctness of the proposed algorithms, methodologies, protocols, and models with extensive simulation results, but they also have wide applicability to other networks.